PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 285–292

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: seismic vulnerability; reinforced concrete; seismic prevention; earthquake 2009; modelling. Abstract The legislator, in the technical regulations of the last 50 years, has always imposed very stringent and invariable conditions for a reinforced concrete (r.c.) masonry deck to be assumed to be infinitely rigid in its own plane; among them, the required presence of a reinforced slab of thickness ≥ 4 cm is very onerous. The article identifies the conditions under which a deck, equipped with such a slab even without reinforcement, may be assumed to be infinitely rigid in its own plane, illustrating the calculations carried out to achieve this result using a simplified numerical model and on the basis of the geometric characteristics of the construction and the stresses induced by the seismic action. It is hoped that the new technical regulations will make use of these results, thus simplifying the construction process in order to better align it with market requirements and historical and current construction practice. XX ANIDIS Conference The hypothesis of infinitely rigid decks in their own plane for reinforced concrete constructions Franco Braga a , Carmenzo Miozzi b,* , Giuseppe Rossi c , Massimo Sessa d a Former Professor of Construction Technique of the Department of Structural and Geotechnical Engineering, Via Eudossiana 18, 00184, Rome c Official of the Special Office for Post Earthquake Reconstruction 2016 of the Abruzzo Region, Via Salaria Antica Est 27, 67100, L'Aquila c Freelancer, Vicolo del Fontanile Arenato 2, 00163, Rome d President of the Superior Council of Public Works, Via Nomentana 2, 00161, Roma

* Corresponding author. Tel.: . E-mail address: carmenzo.miozzi@gmail.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.037